US PATENT SUBCLASS 564 / 437
.~.~.~ Purification or recovery

Current as of: June, 1999
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564 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ AMINO NITROGEN CONTAINING (E.G., UREA, SULFONAMIDES, NITROSAMINES, OXYAMINES, ETC., AND SALTS THEREOF) {37}
305  DF  .~.~ Benzene ring containing {24}
437.~.~.~ Purification or recovery {2}
438  DF  .~.~.~.~> By salt formation
439  DF  .~.~.~.~> Of compound having amino nitrogen and hydroxy bonded directly to the benzene ring (H of -OH may be replaced by a substituted or unsubstituted ammonium ion or a Group IA or IIA light metal)

DEFINITION

Classification: 564/437

(under subclass 305) Processes directed to the purification, separation, or recovery of moncyclic amine nitrogen containing compounds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

424+, for the separation of isomers.